revert 1551
Merge remote-tracking branch 'zkoss/master' into zkoss-master
1048-clear-validation-message
Merge commit '1048-clear-validation-message' into master
Fix bug ZK-1524: use caption in window will cause hflex="min" doesn't work
http://tracker.zkoss.org/browse/ZK-1524
Fix bug ZK-1574: window vflex="min" calculate wrong height in tablet
http://tracker.zkoss.org/browse/ZK-1574
Merge remote-tracking branch 'VincentJian/B65-ZK-1524'
Bug ZK-1524
Fix bug ZK-1572: Scrolling-Bug in Listbox with freezed columns with ie9
http://tracker.zkoss.org/browse/ZK-1572